I agree with the low speed. I turn a lot of big out of balance pieces and generally start at 100 rpm and work my way up as it becomes more balanced. I use a Nova DVR XP and has 280 lbs of sand for ballast. I would think a Jet 1642, Nova 1624-44 or a Nova DVR would do everything you need if you are wanting to do large pieces.. My brother turns on a 1624-44 and he gets along fine with big pieces.
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